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INFORMATION BY OPERATING SEGMENT (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 subsidiary | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 subsidiary | Sep. 30, 2012 | Sep. 30, 2011
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of entity subsidiaries | 7 |  |  |  |  |  |  |  |  | 7 |  |  |  |  |
Amount of depreciation and amortization for Non-Regulated Gas Marketing included in Non-Regulated Gas Marketing Expenses on the Statements of Consolidated Income |  |  |  |  |  |  |  |  |  | $ 300,000 |  | $ 300,000 |  | $ 100,000 |
Amount of depreciation, amortization, and accretion for Other included in Other Operating Expenses on the Statements of Consolidated Income |  |  |  |  |  |  |  |  |  | 600,000 |  | 300,000 |  | 200,000 |
After-tax earnings resulting from the non-regulated sale of propane inventory |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,100,000 |
Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | (9,636,000) | [1] | 6,584,000 | 30,242,000 | 25,568,000 | (651,000) | 8,433,000 | 29,684,000 | 25,174,000 | 52,758,000 |  | 62,640,000 |  | 63,825,000 |
Unrealized loss (gain) on energy-related derivatives |  |  |  |  |  |  |  |  |  | 614,000 |  | (314,000) |  | (1,415,000) |
Lower of cost or market inventory adjustments |  |  |  |  |  |  |  |  |  | 868,000 |  | 0 |  | 0 |
Realized (gain) loss on economic hedges prior to the sale of the physical commodity |  |  |  |  |  |  |  |  |  | (25,000) |  | 163,000 |  | 0 |
Acquisition, divestiture and restructuring activities |  |  |  |  |  |  |  |  |  | 10,797,000 |  | 123,000 |  | 0 |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  |  | 65,012,000 |  | 62,612,000 |  | 62,410,000 |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  |  | 1,017,019,000 |  | 1,125,475,000 |  | 1,576,360,000 |
Total Operating Revenues | 147,114,000 | [1] | 165,289,000 | 397,613,000 | 307,003,000 | 169,538,000 | 186,849,000 | 358,175,000 | 410,913,000 | 1,017,019,000 |  | 1,125,475,000 |  | 1,603,307,000 |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural and propane gas |  |  |  |  |  |  |  |  |  | 433,442,000 |  | 397,304,000 |  | 549,947,000 |
Other operation and maintenance expenses |  |  |  |  |  |  |  |  |  | 180,342,000 |  | 167,351,000 |  | 172,938,000 |
Depreciation & amortization |  |  |  |  |  |  |  |  |  | 48,283,000 |  | 40,739,000 |  | 39,214,000 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  |  | 60,079,000 |  | 53,672,000 |  | 60,752,000 |
Total Gas Utility Operating Expenses |  |  |  |  |  |  |  |  |  | 722,146,000 |  | 659,066,000 |  | 822,851,000 |
Gas Marketing |  |  |  |  |  |  |  |  |  | 176,554,000 |  | 353,283,000 |  | 652,567,000 |
Other |  |  |  |  |  |  |  |  |  | 21,825,000 |  | 2,524,000 |  | 9,642,000 |
Costs and Expenses |  |  |  |  |  |  |  |  |  | 920,525,000 |  | 1,014,873,000 |  | 1,485,060,000 |
Operating Income | (9,722,000) | [1] | 12,282,000 | 51,849,000 | 42,085,000 | 1,869,000 | 15,045,000 | 50,583,000 | 43,105,000 | 96,494,000 |  | 110,602,000 |  | 118,247,000 |
Interest income |  |  |  |  |  |  |  |  |  | 1,088,000 |  | 1,309,000 |  | 1,136,000 |
Interest charges |  |  |  |  |  |  |  |  |  | 28,602,000 |  | 24,945,000 |  | 25,417,000 |
Income Tax Expense |  |  |  |  |  |  |  |  |  | 17,578,000 |  | 26,289,000 |  | 29,182,000 |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  |  | 65,012,000 |  | 62,612,000 |  | 62,410,000 |
Total assets | 3,125,386,000 |  |  |  |  | 1,880,262,000 |  |  |  | 3,125,386,000 |  | 1,880,262,000 |  | 1,783,082,000 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 130,788,000 |  | 108,843,000 |  | 67,638,000 |
Intersegment Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 26,947,000 |
Gas Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  |  | 56,635,000 |  | 48,089,000 |  | 46,952,000 |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  |  | 847,224,000 |  | 763,447,000 |  | 911,614,000 |
Total Operating Revenues |  |  |  |  |  |  |  |  |  | 857,762,000 |  | 764,651,000 |  | 913,190,000 |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural and propane gas |  |  |  |  |  |  |  |  |  | 469,098,000 |  | 414,846,000 |  | 549,947,000 |
Other operation and maintenance expenses |  |  |  |  |  |  |  |  |  | 180,702,000 |  | 167,351,000 |  | 172,938,000 |
Depreciation & amortization |  |  |  |  |  |  |  |  |  | 48,283,000 |  | 40,739,000 |  | 39,214,000 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  |  | 60,079,000 |  | 53,672,000 |  | 60,752,000 |
Total Gas Utility Operating Expenses |  |  |  |  |  |  |  |  |  | 758,162,000 |  | 676,608,000 |  | 822,851,000 |
Gas Marketing |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Costs and Expenses |  |  |  |  |  |  |  |  |  | 758,162,000 |  | 676,608,000 |  | 822,851,000 |
Operating Income |  |  |  |  |  |  |  |  |  | 99,599,000 |  | 88,043,000 |  | 90,339,000 |
Interest income |  |  |  |  |  |  |  |  |  | 947,000 |  | 1,230,000 |  | 1,057,000 |
Interest charges |  |  |  |  |  |  |  |  |  | 26,137,000 |  | 25,156,000 |  | 25,544,000 |
Income Tax Expense |  |  |  |  |  |  |  |  |  | 19,243,000 |  | 17,393,000 |  | 18,694,000 |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  |  | 56,635,000 |  | 48,089,000 |  | 46,952,000 |
Total assets | 2,981,016,000 |  |  |  |  | 1,758,952,000 |  |  |  | 2,981,016,000 |  | 1,758,952,000 |  | 1,641,386,000 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 128,496,000 |  | 106,734,000 |  | 67,304,000 |
Gas Utility [Member] | Intersegment Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  |  | 10,538,000 |  | 1,204,000 |  | 1,576,000 |
Gas Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  |  | 8,936,000 |  | 12,273,000 |  | 8,962,000 |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  |  | 165,146,000 |  | 358,145,000 |  | 645,042,000 |
Total Operating Revenues |  |  |  |  |  |  |  |  |  | 189,331,000 |  | 373,475,000 |  | 669,375,000 |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural and propane gas |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other operation and maintenance expenses |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation & amortization |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total Gas Utility Operating Expenses |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Gas Marketing |  |  |  |  |  |  |  |  |  | 176,554,000 | [2] | 353,286,000 | [2] | 652,567,000 | [2]
Other |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Costs and Expenses |  |  |  |  |  |  |  |  |  | 176,554,000 |  | 353,286,000 |  | 652,567,000 |
Operating Income |  |  |  |  |  |  |  |  |  | 12,777,000 |  | 20,189,000 |  | 16,808,000 |
Interest income |  |  |  |  |  |  |  |  |  | 103,000 |  | 175,000 |  | 165,000 |
Interest charges |  |  |  |  |  |  |  |  |  | 135,000 |  | 81,000 |  | 14,000 |
Income Tax Expense |  |  |  |  |  |  |  |  |  | 5,162,000 |  | 7,966,000 |  | 6,570,000 |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  |  | 8,936,000 |  | 12,273,000 |  | 8,962,000 |
Total assets | 163,944,000 |  |  |  |  | 190,709,000 |  |  |  | 163,944,000 |  | 190,709,000 |  | 175,352,000 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 44,000 |  | 140,000 |  | 215,000 |
Gas Marketing [Member] | Intersegment Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  |  | 24,185,000 |  | 15,330,000 |  | 24,333,000 |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  |  | (559,000) |  | 2,250,000 |  | 6,496,000 | [3]
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  |  | 4,649,000 |  | 3,883,000 |  | 19,704,000 |
Total Operating Revenues |  |  |  |  |  |  |  |  |  | 6,274,000 |  | 4,925,000 |  | 20,742,000 |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural and propane gas |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other operation and maintenance expenses |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation & amortization |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total Gas Utility Operating Expenses |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Gas Marketing |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other |  |  |  |  |  |  |  |  |  | 22,157,000 | [4] | 2,555,000 | [4] | 9,642,000 | [4]
Costs and Expenses |  |  |  |  |  |  |  |  |  | 22,157,000 |  | 2,555,000 |  | 9,642,000 |
Operating Income |  |  |  |  |  |  |  |  |  | (15,882,000) |  | 2,370,000 |  | 11,100,000 |
Interest income |  |  |  |  |  |  |  |  |  | 343,000 |  | 371,000 |  | 217,000 |
Interest charges |  |  |  |  |  |  |  |  |  | 2,635,000 |  | 175,000 |  | 162,000 |
Income Tax Expense |  |  |  |  |  |  |  |  |  | (6,827,000) |  | 930,000 |  | 3,918,000 |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  |  | (559,000) |  | 2,250,000 |  | 6,496,000 | [3]
Total assets | 115,560,000 |  |  |  |  | 102,241,000 |  |  |  | 115,560,000 |  | 102,241,000 |  | 129,176,000 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 2,248,000 |  | 1,969,000 |  | 119,000 |
Other [Member] | Intersegment Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  |  | 1,625,000 |  | 1,042,000 |  | 1,038,000 |
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total Operating Revenues |  |  |  |  |  |  |  |  |  | (36,348,000) |  | (17,576,000) |  | 0 |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural and propane gas |  |  |  |  |  |  |  |  |  | (35,656,000) |  | (17,542,000) |  | 0 |
Other operation and maintenance expenses |  |  |  |  |  |  |  |  |  | (360,000) |  | 0 |  | 0 |
Depreciation & amortization |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total Gas Utility Operating Expenses |  |  |  |  |  |  |  |  |  | (36,016,000) |  | (17,542,000) |  | 0 |
Gas Marketing |  |  |  |  |  |  |  |  |  | 0 |  | (3,000) |  | 0 |
Other |  |  |  |  |  |  |  |  |  | (332,000) |  | (31,000) |  | 0 |
Costs and Expenses |  |  |  |  |  |  |  |  |  | (36,348,000) |  | (17,576,000) |  | 0 |
Operating Income |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest income |  |  |  |  |  |  |  |  |  | (305,000) |  | (467,000) |  | (303,000) |
Interest charges |  |  |  |  |  |  |  |  |  | (305,000) |  | (467,000) |  | (303,000) |
Income Tax Expense |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total assets | (135,134,000) |  |  |  |  | (171,640,000) |  |  |  | (135,134,000) |  | (171,640,000) |  | (162,832,000) |
Capital expenditures |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Eliminations [Member] | Intersegment Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  |  | $ (36,348,000) |  | $ (17,576,000) |  | $ 0 |
[1] | All quarters of 2013 reflect transaction costs incurred associated with the acquisition of MGE. The fourth quarter of 2013 includes one month of activity of the operations of MGE, significant transaction costs incurred in the quarter and the interest impact of the debt issued in the quarter. Total impact of all of these during the quarter was a decrease in net income of $5.5 million.
[2] | Depreciation and amortization for Gas Marketing is included in Gas Marketing Expenses on the Statements of Consolidated Income ($0.3 million for fiscal year 2013, $0.3 million for fiscal year 2012, and $0.1 million for fiscal year 2011).
[3] | Net economic earnings include income realized by the Utility from separate non-regulated sales of propane inventory no longer needed to serve utility customers, of which occurred in fiscal year 2011. This transaction resulted in after-tax earnings totaling $6.1 million.
[4] | Depreciation, amortization, and accretion for Other is included in the Other Operating Expenses on the Statements of Consolidated Income ($0.6 million for fiscal year 2013, $0.3 million for fiscal year 2012 and $0.2 million for fiscal year 2011).

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